I don't love everything that Sienna Miller wears, but the girl has a knack for layering:
Tod's T Bag Tote ($1500.00), cashmere scarf, leggings, black boots (Christian Louboutin??).
Get this look for less:
Black Fleece Blazer, forever21.com, $$32.80; Hype Bag, $213.00; Siegerson Morrison Riding Boots, $200.00; Cozy Fringed Scarf, urbanoutfitters.com, $20.00